The document defines a music video as a short video used to market and promote an artist's music and merchandise. It discusses the origins of music videos in the 1980s and purposes such as selling songs, entertaining audiences, and marketing artists. The history section outlines early forms like musical films from the 1930s and Soundies in the 1940s. It then covers the rise of television and how MTV launched in 1981 as a 24-hour music channel, helping popularize the format. Finally, common elements of music videos are defined like performance, narrative, thematic, symbolic, and cameo appearances.